The hexadecimal color code #01b949 is a medium dark shade of green-cyan. In the RGB color model #01b949 is comprised of 0.39% red, 72.55% green and 28.63% blue. In the HSL color space #01b949 has a hue of 143° (degrees), 99% saturation and 36% lightness. This color has an approximate wavelength of 543.02 nm.
It is a widely accepted notion among painters that it does not matter what one paints as long as it is well painted. This is the essence of academicism. There is no such thing as good painting about nothing.
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There is no must in art because art is free.
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Don't be an art critic, but paint, there lies salvation.